The standard deviation of the population of individual scores is 15. A random sample of 40 subjects yields a mean of 105.
a. Calculate the standard error of the mean.
b. Test the hypothesis, via the z test, that this sample could be representative of a population whose mean is known to be 100.

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The Answer of The standard deviation of the population of individual scores is 15. A random sample of 40 subjects yields a mean of 105.
a. Calculate the standard error of the mean.
b. Test the hypothesis, via the z test, that this sample could be representative of a population whose mean is known to be 100.

The Standard Deviation of the Population of Individual Scores Is